Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hr9qf-0004Sb-7K for pgsql-hackers@arkaria.postgresql.org; Fri, 26 Jul 2019 23:42:05 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.89) (envelope-from ) id 1hr9qe-00011L-29 for pgsql-hackers@arkaria.postgresql.org; Fri, 26 Jul 2019 23:42:04 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hr9nA-0008TT-2d for pgsql-hackers@lists.postgresql.org; Fri, 26 Jul 2019 23:38:28 +0000 Received: from mail-qk1-x743.google.com ([2607:f8b0:4864:20::743]) by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hr9n7-00034h-AB for pgsql-hackers@postgresql.org; Fri, 26 Jul 2019 23:38:27 +0000 Received: by mail-qk1-x743.google.com with SMTP id g18so40309443qkl.3 for ; Fri, 26 Jul 2019 16:38:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=2ndquadrant-com.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :content-transfer-encoding:in-reply-to:user-agent; bh=TmxKsxYNYNe2C9Jh+PF1vxHJClaWAOfuE7qABsYvMFI=; b=TfMFU8RbDyREFQXqhhzvP5acQHWzb/KP4+CmRRpfSJLNELs4lxYQBRGiTaJVYbfe/W 1aPk96nYcHAOmBDmJc+tAz2uYtZ8o3D6UVsSbY9raCtDX56wuoas0b1LyFW6ubXRbRqz DufNWR76eMczn2u0uhjZLBm0xzVSNDzvgr13PNhlCyYdBZJc0/fJnIKMaTom/sED7/YD Ng9Jm7Oow2WXJnrm+/9tIFCprq1Z3wHNNZBQQtBi21c1Yk0Xvaf16z3346FH21NeCa2X WGS06u6qdyGsVBqu9qDUvcHUEiZfZqz0i07u21qINe9jn1eAw1aMK5nW7lKXoUSbQ9RJ QrBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:content-transfer-encoding:in-reply-to :user-agent; bh=TmxKsxYNYNe2C9Jh+PF1vxHJClaWAOfuE7qABsYvMFI=; b=gnpePk8dwc9rXTsRqCjLbkiwoNBgEerWnV2NGdPSq74K5thrNW1pSkRqn6tftdadwc sl32qOUSfBIQa6Pm7iRqHZzTPEjqWxHj501OW1lMZD+y6CFbUg0VTA6YKysYDDWIVR7h oZKB+gWA+sYf65E3F4+OwPA7u0+0vlzO4yi2kER+wYm5hz5oCJEivaUEsav673YZBSkr FWOnz8Zc1pwW/rbfiHaf/QKZfeuQq5pvY7NVaeJkC4Tl0c1Ekx79m5hfgAkqKMT5/pGX GFx55Q5p5FRyfupW69M6T0L/LAzCDlYSXLU5gbd0TnaesR1q4coQ/FYSC7N/H66nrQT5 weBg== X-Gm-Message-State: APjAAAXZayVQ1TL4EMQhuvTthgrynkgjXRAYPlowdg6WLod7RJQPVVj/ 5adx8yixmoMYtIxoSzPF8E6Wmg== X-Google-Smtp-Source: APXvYqzthxwm42uYwEEf0WgkEGT5fpTAdPHLWfF0mmWxUDDABMiAhKJp956B/FmpqyFa1VPR0SbVBg== X-Received: by 2002:ae9:eb4e:: with SMTP id b75mr63504779qkg.478.1564184303452; Fri, 26 Jul 2019 16:38:23 -0700 (PDT) Received: from nimloth.alvh.no-ip.org ([179.56.49.109]) by smtp.gmail.com with ESMTPSA id z4sm27896495qtd.60.2019.07.26.16.38.18 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 26 Jul 2019 16:38:18 -0700 (PDT) Received: by nimloth.alvh.no-ip.org (Postfix, from userid 1000) id ED6B5120D50; Fri, 26 Jul 2019 18:05:38 -0400 (-04) Date: Fri, 26 Jul 2019 18:05:38 -0400 From: Alvaro Herrera To: Rui Hai Jiang Cc: Robert Haas , Tom Lane , PostgreSQL Hackers Subject: Re: TopoSort() fix Message-ID: <20190726220538.GA17809@alvherre.pgsql> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk On 2019-Jul-04, Rui Hai Jiang wrote: > I'll try to figure out some scenarios to do the test. A parallel process > group is needed for the test. > > Actually I was trying to do some testing against the locking mechanism. I > happened to see this issue. Hello, is anybody looking into this issue? -- Álvaro Herrera https://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services